<div class="sureX">
    <div class="loginX">
        <div class="title">登录Login</div>
        <form class="boxX">
            <div class="item">
                <div class="inputX">
                    <span>账号</span>
                    <input id="username" name="username" placeholder="请输入账号">
                </div>
                <div class="errX">
                    <b>请输入正确的账号</b>
                    <b>没有此账号</b>
                </div>
            </div>
            <div class="item">
                <div class="inputX">
                    <span>密码</span>
                    <input id="password" name="password" placeholder="请输入密码">
                </div>
                <div class="errX">
                    <b>密码须由6-16个字符组成，区分大小写</b>
                    <b>密码错误</b>
                </div>
            </div>
            <div class="item"><a class="forgot" href="javascript:;">忘记密码?</a></div>
            <div class="item"><input type="submit" value="登录" class="submit"></div>
        </form>
    </div>
</div>